/* =============================================================================
   Nexus Tracker Components
   Stripe/Vercel inspired UI components
   ============================================================================= */

/* =============================================================================
   Buttons
   ============================================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 16px;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: 1;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(180deg, #3b82f6 0%, #2563eb 100%);
  color: white;
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,0.1);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(180deg, #2563eb 0%, #1d4ed8 100%);
  box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255,255,255,0.1);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.btn-secondary {
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-secondary);
  border-color: var(--border-focus);
}

.btn-danger {
  background: linear-gradient(180deg, #ef4444 0%, #dc2626 100%);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-danger:hover:not(:disabled) {
  background: linear-gradient(180deg, #dc2626 0%, #b91c1c 100%);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 12px;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.btn-sm {
  padding: 6px 12px;
  font-size: var(--text-xs);
}

.btn-lg {
  padding: 12px 24px;
  font-size: var(--text-base);
}

.btn-block {
  width: 100%;
}

/* =============================================================================
   Form Elements
   ============================================================================= */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-primary);
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--error);
}

.input {
  width: 100%;
  padding: 10px 12px;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.input::placeholder {
  color: var(--text-placeholder);
}

.input:hover {
  border-color: var(--text-tertiary);
}

.input:focus {
  outline: none;
  border-color: var(--blue-500);
  box-shadow: var(--shadow-focus);
}

.input.error {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(239,68,68,0.15);
}

.input.success {
  border-color: var(--success);
  box-shadow: 0 0 0 3px rgba(16,185,129,0.15);
}

.input:disabled {
  background: var(--bg-secondary);
  color: var(--text-tertiary);
  cursor: not-allowed;
}

/* Input with icon */
.input-group {
  position: relative;
}

.input-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}

.input-group .input {
  padding-left: 40px;
}

/* =============================================================================
   Cards
   ============================================================================= */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border-light);
}

.card-title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin: 0;
}

.card-body {
  padding: var(--space-5);
}

.card-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--border-light);
  background: var(--bg-secondary);
}

/* =============================================================================
   Toast Notifications
   ============================================================================= */
.toast-container {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: slideIn 200ms ease;
  pointer-events: auto;
  max-width: 400px;
}

.toast-success { border-left: 3px solid var(--success); }
.toast-error { border-left: 3px solid var(--error); }
.toast-warning { border-left: 3px solid var(--warning); }
.toast-info { border-left: 3px solid var(--info); }

.toast-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
}

.toast-message {
  font-size: var(--text-sm);
  color: var(--text-primary);
}

.toast-close {
  flex-shrink: 0;
  padding: 4px;
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.toast-close:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(100%); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(100%); }
}

/* =============================================================================
   Theme Toggle
   ============================================================================= */
.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

/* =============================================================================
   Loading States
   ============================================================================= */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-light);
  border-top-color: var(--blue-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm { width: 16px; height: 16px; }
.spinner-lg { width: 32px; height: 32px; }

@keyframes spin {
  to { transform: rotate(360deg); }
}

.btn .spinner {
  border-color: rgba(255,255,255,0.3);
  border-top-color: white;
}

/* =============================================================================
   Badges
   ============================================================================= */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: 9999px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.badge-success {
  background: var(--success-bg);
  color: var(--success);
}

.badge-warning {
  background: var(--warning-bg);
  color: var(--warning);
}

.badge-error {
  background: var(--error-bg);
  color: var(--error);
}

.badge-info {
  background: var(--info-bg);
  color: var(--info);
}

/* =============================================================================
   Logo
   ============================================================================= */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  text-decoration: none;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--font-bold);
  font-size: var(--text-sm);
}